How local area conditions may be linked to lung health across Canada

Background

Where people live can influence their health in many ways, including lung health. However, less is known about how social and economic conditions in local areas are linked to lung health in older adults.

Researchers in Canada investigated whether there is a relationship between an area’s social and economic conditions and lung health in adults. They looked at differences in lung function, respiratory symptoms and exercise capacity in adults taking part in a long-term study.

What did the study look at?

The study used data from 1,449 adults taking part in the CanCOLD study, a long-term research project on lung health in Canada. Participants were recruited from nine cities and followed for around three years, with repeated health assessments during this time.

Researchers measured:

• Lung function using breathing tests
• Exercise capacity using cardiopulmonary exercise testing (a detailed test of how the heart and lungs respond to exercise)
• Respiratory symptoms and health-related quality of life using questionnaires
• Changes on CT scans of the lungs in some participants

Local area conditions were assessed using a measure called the ‘Material and Social Deprivation Index’, which reflects social and economic conditions in locations based on factors including income, employment, education and social circumstances.

Participants were then grouped based on whether they lived in areas with more or fewer favourable social and economic resources.

What did the study find?

People living in areas with less favourable social and economic conditions had:

• Lower lung function
• Lower exercise capacity
• More respiratory symptoms
• More air trapping in the lungs (where air remains in the lungs after exhaling)

Some measures of lung function also showed a faster decline over the three-year follow-up.

Importantly, the associations between local area conditions, lung function and exercise capacity remained even after accounting for other factors such as age, smoking and existing health conditions.

For other outcomes, including CT scan results, flare-ups of lung symptoms and deaths, the study did not find clear differences between the groups.

Why is this important?

This study adds to evidence that lung health may be influenced not only by individual factors such as smoking or medical history, but also by the social and economic conditions of the areas where people live. Understanding these wider influences may help identify groups who could be at higher risk of poorer lung health and support more targeted public health approaches.

It also highlights the need for further research into how neighbourhood-level conditions may affect lung health over time.

Read the original research paper:

ERJ paper: The Impact of Neighborhood Material and Social Disadvantage on Respiratory Health Across Canada